Mask attachment



FIG. 1 is a front elevational view of mask attachment showing our new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front, top, right side perspective view thereof, with the cover pulled back; and,

FIG. 8 is a left side perspective view thereof in use condition; the broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a mask attachment, as shown and described. 